1948 Westinghouse Model 1821 (182) audio problems
Posts: 325
Threads: 34
Joined: Dec 2019
City: Elkhart
State, Province, Country: Indiana
Quote:Even 50 is wrong. Should not exceed 40uF.
morzh, 50 MFD is NOT incorrect, that's what's in there right now, its a 3 section can that has 2 sections that are rated at 50 MFD @ 150 WVDC and then a 3rd section that is 20 MFD @ 25 WVDC, the filter cap can that's in there right now is the original unit to the radio, the Riders even calls for a 50/50 MFD @150 WVDC and 20 MFD @ 25 WVDC.
Unfortunately there's no such thing as a 50 MFD cap anymore since they changed the capacitor rating system back in the 1970s, so the next closest thing is a 47 MFD (which I don't have on hand right now, I would have to order it) or a 68 MFD Cap (which I don't have any of those around either and those would have to be ordered too).
So either way right now the only capacitor I had on hand was the one that could replace the 20 MFD at 25V unit, which I replaced that with a 22 MFD at 63V.
But the good thing is, the place where all of the e-caps need to go are conveniently located near a terminal strip with an unused lug that ties to chassis ground so all I need to do is get some axial lead 47 MFD or 68 MFD @ 160 V e-caps to replace the remaining sections of the old can and solder the negative leads to the unused terminal strip that's tied to chassis ground and then tie the positive leads to their respective terminal leads, and that has eliminated about a foot and a half of wire out of the chassis that was used to connect the old can cap to their respective tie points, and thus cleaning up the chassis more.
Also in regards to the output transformer that I had said was "dead" it actually isn't because when I was probing around in the radio with it turned on with my DMM (the radio was plugged into an isolation transformer) I was able to get it to produce a hum, a loud hum at that, so I'm wondering if there isn't a cold solder joint on one of the output transformer primary leads and where they connect.
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RE: 1948 Westinghouse Model 1821 (182) audio problems - by captainclock1988 - 09-10-2020, 10:32 AM
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